Bearing extraction device for a suction press roll



2 Sheets-Sheet 1 R. H. HART ETAL BEARING EXTRACTION DEVCE FOR A SCTION PRESS ROLL March 2, 1965 Filed Dec. 12, 1962 March 2, 1965 la;l H, HART ETAL 3,171,776

BEARING EXTRACTIGN DEVICE FOR A SUCTION PRESS ROLL)4 Filed Dec. 12, 1962 2 Sheets-Sheet 2 Bv Z676) United States Patent O 3,171,776 BEARING EXTRACHN DEWCE EGR A SUCTION PRESS RLL Robert H. Hart and Paul E. Van Horn, Beloit, Wis.,

assignors to Beloit Corporation, a corporation of Wisconsin Filed Dec. 12, 1962, Ser. No. 244,043 4 Claims. (Cl. 162-369) This invenion relates to anti-friction bearing means, and more particularly to an improvement for the removal of bearings in suction rolls used in paper making machinery.

As is well known, conventional suction rolls used in paper making machinery range in length frame 90 inches to 320 inches and comprise a perforate rotating cylinder or shell containing internally therein a relatively stationary suction box co-acting against the inner surface of the shell. In operation, a relatively high vacuum is maintained in the suction box, which vacuum is communicated to a sheet of pulp carried on the shell through perforations in the shell to thereby extract water from the sheet and compact the same. Depending upon -their particular location in the paper machine, the suction rolls are formed of metal, as for example stainless steel and bronze, and may vary in diameter from about sixteen inches (16)k to as much as about sixty inches (60"). Rolls of this type are generally very heavy and expensive in construction, and are normally driven at high rates of speed, at which speeds the bearings frequently become severelyl damaged from use requiring their renewal.

Typical suction rolls are ydescribed in US. Patent No. 1,799,775, granted to E. E. Berry, and in U.S. Patent'No. 2,714,342, granted to E. D. Beachler. As described in these patents, the front extension of the suctionbox is supported against rotation at its outer end on a hollow sectional pedestal which is provided with a suitable means of communications between the interior of the `suction box and a suitable source of vacuum. At .the rear endof the suction box, the suction box is provided with a stub shaft or journal for mounting in an anti-friction bearing assembly which in turn is frictionally fitted within a hollow journal depending from an adjacent head of the shell. The hollow journal of the head forms ahousing for the bearing assembly, and is presently designed to be an integral part of the head assembly so as to reduce the number of parts and machining operations. As can be appreciated, the removal of anti-friction bearings from the integral housing of the head can become quite diiiicult particularly where the construction of the head impedes and obstructs access to the bearing, and often requires torch cutting with possible ilame damage to the surrounding housing. This, of course, is not only expensive but prolongs the down time of t'ne equipment by keeping thev roll out of operation during the repairing and renewal of the bearings.

Accordingly, it is an object of this invention to eliminate disadvantages of the prior art.

Another object of this invention isto provide a novel arrangement for the removal of anti-friction' bearings.

It is a further object of this invention to provide a novel extraction means for the removal of anti-friction bearing means from their housings.

A still further object fo this invention is to provide a novel hydraulically actuated extraction means for the removal of anti-friction bearing means from their housings.

It is also an object of this invention to provide animproved suction roll comprising a perforate shell provided With heads at the ends thereof, with one of the heads having a hollow extended journal forming a housing for a bearing assembly in which is mounted a shaft of a suction box adapted to contact the interior of theroll and to coniine an area thereof, with the said hollowjournal containing within its chamber a' iiuid driven piston means for the removal of the bearing from the hollow journal;

Other objects and advantages of this invention become more apparent from the following description and drawings in which;

FIGURE l is a broken, longitudinal sectional view of a suction roll illustrating one embodiment off this invention;

FIGURE 2 is a sectional view taken-along lines II-II of FIGURE 1;

FIGURE 3 is a sectional view of a suction roll head illustrating another embodiment of this invention; and

FIGURE 4 is a sectional view of another suction roll head illustrating a still further embodiment of this invention.

Generally speaking, this invention comprehends a suctionroll which includes a rotatable perforated cylindrical shells, the shell having provided internally thereof a suction box which co-acts with the shell and also has provided thereon a journal mounted in an end-wall of the shell, with the suction box adapted to contact the interior of the shell and to conline an area thereof. To adapt the shell for rotation about the suction box a conventional anti-friction bearing means is interposed between the suction box journal and the end-wall of the shell,.with the bearing means frictionally iitted in the end-wall. To facilitate removal of the bearing means an axially movable piston means is mounted in the referred to shell end-wall opposite to and insealing relationship to the bearing meansV with the piston means disposed externally of the bearing means and adapted for actual movement together with the bearing means toward the interior of the shell. Movement of the piston means, together with the bearing means, is accomplished by suitable hydraulic means which is operativelyT connected with the piston in a manner adaptedv to actuate the piston in movementtoward the interior of the shell structure.

More specically, by reference to the drawings as shown in FIGURE l, the suction roll structure 1 consists of acylindrical outer shell 2 peripherally enclosed within a rubber casing or lining 3', with both the shell and the casing eing radially perforated as at 4 to provide a perforated drum construction. One open end of the roll shell structure has secured t0 it an angular shell ring 5 and the other open end of the shell has secured to it, by means of bolts 6, a rear shell head 15 provided with a radial flange i formed upon a hollow journal `or hub 8;

The shell is adapted-for rotation by providingat the inner end of shell ring 5 bearing assembly'9 which is mounted on a suction gland sleeve 1t) in'turn iixedly secured as by bolts 11 to an open 'endof a suction box 12. The outer end vof Ithe sleeve 10 is suitably mounted within any convenient roll supporting structure or stand, not shown. As can be seen the shell structure is adapted by the bearing elements 9 for rotation about the tixed gland sleeve 1i).

The shell structure is also rotatably mounted upon the suction box at its other end by a bearingassernbly 13` which is interposed between the shell structure head 1Sy and a xed suction box stub shaftor axle'14 carried by, a suction` box closure plate 16 ixedly secured by means of bolts 17 to a suction box end plate 18. The hollow journal 8- is mounted Within a journal housing 19 and adapted for rotation by means of' a bearingv assembly'lti interposed betitfeentheV journal and the housing. Rotation of the shell structure is accomplished by means of a coupling 37imounted on` a-shell driving shaft 38 and connectedto a suitable drive means, not shown.

The stub shaft 14, of the suction box closure plate 16;: is mounted in the anti-friction bearing means 13 bv means of a sleeve 21 which is mounted on the stub shaft 14 with a light fit so as to afford easy removal of the stub shaft 14 from the sleeve 21. The bearing means 13 is mounted in shell head 15 within a chamber 22 defined by the hollow of the journal 8. As shown in drawings, the Kannular chamber 22 decreases outwardly in diameter and extends `outwardly into the journal 8 wherein it is contained by the solid portions at the end of the journal 8. Mounted within the annular chamber 22 against an annular shoulder 23 is a piston 24 of concave conguration suitably reinforced by Webs 25. The piston is positioned immediately behind the bearing assembly 13 in contact with the outer race 26 thereof. The piston 24 thus serves as a positive stop for the bearing assembly 13 and thus determines the bearing position with respect to the shell head 15. This portion of the concave configurate piston 24 defines a compartment 29 for containing lubricating oil therein supplied to the bearing assembly 13 by means of .an inlet 30. The oil reservoir 29 is closed by means of a cover plate 31 provided at the other side of the bearing assembly and disposed in sealing relationship with sleeve 21.

Fluid communication with the journal chamber 24 is effected by means of quick-disconnect fittings or nipples 32, as for example ordinary grease vents, or other suitable fittings, mounted` at the ends of ports 33 and 34 extending to the chamber 22. If desired the volume of chamber 24 can be decreased by means of a ller plug 35 formed of a suitable material, for example a wooden plug 36 enclosed Within a synthetic plastic envelope or lining, as for example any suitable epoxy mixture which is illustrated in FIGURE 3. The suction box 12, in accordance with conventional construction, comprises a substantially cylindrical body portion 40 open at the top, adjacent to the inner wall of the shell, and provided with spaced vertical walls 41 and 42. Sealing between the suction box and the inner surface of the shell structure is accomplished by means of packing 43 mounted along the top surface of the suction box side walls 41 and 42, with the sealing facilitated and lubrication of the packing accomplished by means of water conduits 45. In this manner, during rotation of the shell structure around the packing box, the packing side Walls 41`and 42 together with their associated packing confine an area along a longitudinal portion of .the shell within which suction may applied to a web of pulp traveling over said shellV through the perforations of the shell.

' For disassembling the roll, the front head of the shell structure isy detached from the shell, and the head together with the suction box 12 is rolled out of the shell structure.

In order to remove the bearing 13 with liquid pressures, any one of the lowermost air escape vents or ports 33 is maintained closed while the uppermost air escape line 33 is open. A liquid under pressure is then applied to chamber 22, of the hollow journal 8, by means of fluid lines, not shown, and external valving suitably connected either through port 34 or through the lowermost port 33. The uid is injected into'the chamber until substantially all of the air has been vented through the open port. v

Thereafter, the open port is closed and application of the liquid continued to increase the pressure in the chamber 22, until the magnitude of the pressure is reached sufficient to move the piston 24 with sufcient force against the bearing assembly 13 to axially move the bearing assembly out of annular chamber 22. The liquidY or uid pressure applied to chamber 22 may be applied by any convenient means such as a hand pump or ordinary grease pump. It will be appreciated that the desired number and placement of the air escape vents or ports 33 may be provided in the hollow journal 8 to the chamber 22 governed solely by the convenience desired for access in attaching the pressure lines or piping to the fittings 32. In this manner the chamber 22 of the journal may be conveniently vented and ftuid injected.I

4. therein regardless of the relative position the roll comes to when stopping after rotation.

Although a specific embodiment has been described above, it is to be understood that various other embodiments may also be employed. For example, as shown in FIGURE 3, the hollow of the journal S may be openended with the ends of the journal having xedly secured thereto by bolts 50 an end enclosure plate 51 having provided thereon a shell driving shaft 52. for connection to a suitable drive means for rotation of `the shell.

In similar fashion, as shown in the embodiment of FIGURE 4, the major portion of shell journal 8 may be substantially solid with the piston thereof secured and integrated, as by bolts 53, to the bearing assembly 131 as for example with the bolts mounted in a bearing subhousing 54. In this manner, the position and the bearing assembly will move together as a unit during removal of the bearing means from the shell journal 8.

Although the invention has been described with reference to specific materials, embodiments and details, various modifications and changes, Within the scope of this invention, will be apparent to one skilled in the art and are contemplated to be embraced within the invention.

What is claimed is:

l. A suction roll comprising,

a rotable perforated cylindrical shell,

an end wall mounted on said shell having an axially extending cylindrical bore formed therein opening at one end thereof to the inner face of said end wall and closed at the other end thereof,

a suction box co-acting with said shell and adapted to contact the interior of said shell to confine an area thereof,

a journal xedly mounted on said box and extending into said bore,

anti-friction bearing means interposed between said journal and the wall of said bore and comprising an outer race frictionally tted in the wall of said bore and an inner race receiving said journal,

axially movable piston means slidably carried in said bore between said bearing means and the closed end of said bore and engageable with said bearing at one end thereof to the inner face of said end wall and closed at the other end thereof,

a suction box coasting with said shell and adapted to contact the interior of said shell to conne an area thereof,

a journal iixedly mounted on said box and extending into said bore, anti-friction bearing means interposed between said journal and the wall of said bore and comprisingY an outer race having an outer peripheral wall shaped complementarily to the wall of said bore and frictionally fitted in said bore and an inner race receiving said journal, yaxially movable piston means slidably carried in said bore between said bearing means and the closed end of said bore and engageable with said bearing means, said piston means having an outer peripheral wall being in fluid sealing relationship with the wall of said bore, and

, hydraulic Ymeans communicating with said bore between 5 6 said piston means and the closed end of said bore being in tiuid sealing relationship with the wall to pressurize said bore and to move said piston means of said bore, and into abutting engagement with said bearing means hydraulic means comprising iirst and second conduits to urge said bearing means out of said bore. in said end Wall and `communicating with said bore 3. The structure of claim 2 wherein said journal is 5 between Said piston means and the closed end of removably received in said inner race. Sad bore,

4. Asuction roll comprising, Said lirst conduit means adapted for connection a rotatable perforated cylindrical shell, to a Source. of pressurized Hui@ to Supply Such an end Wall mounted on said shell having an axially mud to sa@ bore to move Siud PISO mems extending cylindrical bore formed therein opening 10 Into abumng engagemeilt with Sald beamig at one end thereof to the inner face of said end Wall means to urge Sad bearmg means out of Sald bore, and said second conduit means communicating said bore to atmosphere and including manually and closed at the other end thereof, a suction box co-acting with said shell and adapted to contact the interior of said shell to confine an 15 operable means eiective to open said bore to area hereef, atmosphere when such fluid is lling said bore a journal fixedly mounted on said box and extending and thereafter to Close Said bgre to develop into said bore, pressure therein.

anti-friction bearing means interposed between said R f C ti journal and the wall of said bore and comprising an 20 e cremes lied m the le of dus patent outer race frictionally lfitted in the wall of said bore UNITED STATES PATENTS and an inner race receiving said journal, 961,375 Seabrook }une14,1910 axially movable piston means slidably carried in said 1,679,598 Berry Aug. 7, 1928 Said piston means having an outer peripheral Wall 3033597 Miller May 8 1962 

1. A SUCTION ROLL COMPRISING, A ROTABLE PERFORATED CYLINDRICAL SHELL, AN END WALL MOUNTED ON SAID SHELL HAVING AN AXIALLY EXTENDING CYLINDRICAL BORE FORMED THEREIN OPENING AT ONE END THEREOF TO THE INNER FACE OF SAID END WALL AND CLOSED AT THE OTHER END THEREOF, A SUCTION BOX CO-ACTING WITH SAID SHELL AND ADAPTED TO CONTACT THE INTERIOR OF SAID SHELL TO CONFINE AN AREA THEREOF, A JOURNAL FIXEDLY MOUNTED ON SAID BOX AND EXTENDING INTO SAID BORE, ANTI-FRICTION BEARING MEANS INTERPOSED BETWEEN SAID JOURNAL AND THE WALL OF SAID BORE AND COMPRISING AN OUTER RACE FRICTIONALLY FITTED IN THE WALL OF SAID BORE AND AN INNER RACE RECEIVING SAID JOURNAL, AXIALLY MOVABLE PISTON MEANS SLIDABLY CARRIED IN SAID BORE BETWEEN SAID BEARING MEANS AND THE CLOSED END OF SAID BORE AND ENGAGEABLE WITH SAID BEARING MEANS, SAID PISTON MEANS HAVING AN OUTER PERIPHERAL WALL BEING IN FLUID SEALING RELATIONSHIP WITH THE WALL OF SAID BORE, AND HYDRAULIC MEANS COMMUNICATING WITH SAID BORE BETWEEN SAID PISTON MEANS AND THE CLOSED END OF SAID BORE TO PRESSURIZE SAID BORE AND TO MOVE SAID PISTON MEANS INTO ABUTTING ENGAGEMENT WITH SAID BEARING MEANS TO URGE SAID BEARING MEANS OUT OF SAID BORE. 